Machine for turning irregular forms



"4 sheetssheet i1 e. WQDUCHEMIN MAC'HiN'E Fori TURNING IRREGULAR FORMS Filed Juhe 4 192/1 Fm Q U- Apr; 10, 1923. 1,451,496

G W DUCHEMIN MACHINE FOR TURNING IRREGULAR FORMS Filed June 4, l92l\ 4 sheets-slush 2 INVENTOR MW TTORN 4 shee ts-sheet 3 INVENTOR fi-Ww BY ORNEY Apr. 10, 1923,

G. W. DUCHEMIN MACHINE FOR TURNING IRREGULAR FORMS Filed June '4, 1921 Apr. 10, 1923.,

G. W. DUCHEMIN MAE'HINE -EOR TURNING IRREGULAR FORMS 4 sheets-sheet 4 Filed June 4,, 1921 ATT RNEY Patented Apr. 10, 1923.

STATES GEORGE W. DUCHEMIN, OF NEWARK, NEW JERSEY.

MACHINE FOR TURNING IRREGULAR FORMS.

Application filed June 4,

To all wk mz't magz concern:

Be it known that I, GEORGE WV, DUoHEMI'N, a British subject, and a resident of Newark, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Machines for Turning Irregular Forms, of which the following is a specification.

This invention relates to an improved.

1 machine for cutting irregular forms, and particularly for making forms of wood and similar material, such as shoe lasts, brush handles, axe handles, in fact any irregular form that can be made by rotating the wood against rotating cutters, this movement being governed in the usual way by a form or pattern against which a tracer wheel presses,'and which wheel is controlled by the shape of the pattern.

The invention is designed to provide a machine of this kind which permits a number of articles to be made at the same time from one pattern, thereby conserving space and also increasing production, and also providing for accuracy in that the construction prevents the articles being cut, and also the pattern, from moving in a straight line relative to the cutter.

The invention further provides a machine 0 which can be used for making right or left hand articles from a single pattern, this being particularly advantageous in the manufacture of shoe lasts, the reversing mechanism being one that has a minimum of lost motion and which can be quickly reversed.

' The invention further consists in certain details of construction to be hereinafter more fully described and finally embodied in the claims.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a front view of the machine. Figure 2 is a side view thereof. Figure 3 is a section on line 3- 3 in Figure 1. Figure 4 is a perspective view illustrating the stop mechanism of the carriage. Figure 5 is a rear perspective view of the carriage. Figure 6 is a detail of the nut of the reversing mecha nism. Figure 7 is a detail front View of one of the cutters. Figure 8 is a detail per spective view of projecting mechanism of the carriage so as to remove the article from the cutters when'the' carriage has completed its forward movement. Figure 9 is an elevation of a latch and part of the starting 1921. Serial No. 474,967.

: lever. Figure 10' is a top view, partly broken away, of the brackets and the supporting frame. 'Figure llis a perspective view of the supporting frame. Figure 12 is a detail showing part of the stop mechanism of the carnage. Figure 13 shows a portion of the carriage and a slide on which the tracer is mounted. Figure 14: is a perspective view showing the reversing mechanism. Figure 15 is a detail view of the return screw of the carriage in elevation of the nut.

The main frame of the machine consists of two side plates 10, which are connected at the top for bracing and also for supporting the parts of the gearing by a topbar 11, and

suitable bracing rods 12 are placed near the bottom thereof to give stiffness to the device. The main shaft at 13 is mounted 1n bearings in rear of the machine and is adapted to be driven by a belt 1 1 from a suitablesource of power. I

Extending across themachine, one at the back and one about the center, are tracks 15 on which slides the carriage 16, which carriage carries the cutters andthe associated mechanism. The carriage l6 slides back and forth on therails, being propelled in one direction by a screw 17, and in the other direction by a screw 18, the screw 17 propelling the carriage forward and the screw 18 bringing it back, the screw 18 being of greater pitch so that the return is rapid.

For the operation of these screws the main shaft 13 is provided with a pulley from which the belt 19 propels a pulley 20 on the jackshaft 21, and a belt 22 from a pulley 23 on the jack shaft 21 operates the short shaft24, and from this, in turn, the belt 25 operates a pulley on the shaft 26 and the worm 27 on the shaft 26 rotates the worm gear 28, which worm gear is mounted on the end of the screw 17. 7

As will be seen from Figure 2, the screw 17 has on its end a gear 29 which, through the gear 30, operates the gear 31 onthe screw 18. A nut 32 is slidably arranged in. the bottom of the carriage, as will be seen particularly from Figure 6, this nut being adapted to reciprocate and having threaded faces 33 and 34m alternately engage the screws 17 and 18, being held normally against one of the screws, such as 17, by reason of the influence of the spring 35.

A step 36 is engaged by the starting lever 37 to hold the nut 32in its retracted posilar 41 on it, which collar has a lip 42, this collar rotatingwith the intermediate shaft, and when the carriage has travelled far enough the lip 42 engages the step 36 and forces it over so that the latch 43 engages the bottom of the step and'thus holds the nut so that its threaded face 34 is in engagement withthe return screw 18, which at once starts the carriage on its return to the starting point.

The nut is permitted to freely slide, since it is provided with a slot 44' through which the intermediate shaft 40 is passed, and the starting lever 37 is carried along with the carriage, since the pivotal point 38 is fastened to a strip 45 which is secured to the carriage.

On the front edge of the carriage are bearings 46, seen particularly in Figure 3, in which are mounted the cutter shafts 47 (Fig. 7 The bearings 46 are on the side plates 48 of the carriage and are driven by suitable belts 49 from pulleys 50 in the rear of the carriage, these in turn being driven by belts 51 which pass over the drum 52, which is a long drum so that the belts can follow the carriage and positively drive the cutter shafts during the whole length of travel of the carriage. Suitable belt tighteners 53 can be installed to regulate the tension of the belts.

The means for supportingthe pattern and also the work being done comprises a frame 54, which is shown particularly in Figures 1 and 11, and I show, in the drawings, a frame large enough to support four lasts 55, although it will be evident that this size can be changed to include a greater or less number, these being supported at their ends in the side of the frame 54, which is preferably rectangular and has on one of its side arms cent-ers56 which have suitable handles 57 which can be withdrawn to permit a quick placing and removal of the centers 56 on and from the lasts.

Projecting rearwardly from the side arms of the frame 54 are the pattern supporting arms 58. one of which is provided also with a center 59 by means of which the pattern 60 can be supported at one end, the carriage 16 being fixed against movement and the working pattern supporting frame being adapted to move toward and from the cutters 61 on the cutter shafts 47, the pattern being adapted to rest against a tracer wheel 62 mounted on the frame, as will be more particularly seen from Figure 5, being adjustable laterally thereon, but fixed against movement longitudinally.

The frame 54 is supported on links 63 at the top and bottom, these links being inclined and pivoted at their centers, as at 64, to the frame, and at their ends to the ends of the brackets 65. The frame 54 has top and bottom bars 66 similarly supported. The brackets 65, four in number, are arranged in two opposed pairs which are pivoted at their supported ends by the pins 67 on the side frames 10. The ends 68 of the brackets are off-set, and in opposed brackets of the same pair one projects to one side and one to the other side of a plane passing through the centers of the pins 67 of such opposed brackets.

This manner of mounting the frame permits it to be moved back and forth while holding the lasts being cut, so that their axis of support remains always at the same angle to the cutters, so that precision of work is insured, in contrast to the varying angle when the cutter or the last is supported on the free end of a swinging bracket. Suitable weights 69 suspended on cords 70 secured to the frame tend to hold the lasts to the cutters.

The lasts are rotated by the rotating studs or axles 71 on one side of the frame 54, these being synchronized by suitable mechanical connections, as the parallel links 72 pivoted to cranks 73 on the axles 71, each crank including an arm 74- connecting the links, so that the opposite ends of the arms 74 are never over a dead center at the same time, as is clearly illustrated and described in my Patent No. 1,363,238, issued Dec. 28, 1920.

One of said axles has a sprocket 75 which is driven by a chain 76 from a sprocket 77 on the shaft 78. The shaft 78 is provided with. a worm gear 7 9 which is in mesh with a worm 80 on the shaft 81. A belt 82 over pulleys on the shafts 81 and 83 drives the shaft 81, and a belt 84 connects a pulley on the shaft 83 with a pulley 85 on the countershaft 86, the counter-shaft being driven by a belt 87 passing over the pulley 88 on the counter-shaft and over a pulley 89 on the jack shaft 21.

The pattern or model is rotated in synchronism with the lasts, one form of transmission being shown in Figures 3 and 14, in which form the links 72 are connected by connecting rods 90 with the crank 91, which is secured to a disk 92 which can be placed on gears 93 or 94, according to whether a last is to be made right or left handed, the lower gear being connected directly to the axle 95 of the pattern support (Fig. 3), and the other, 94, being in mesh therewith and,

when connected by the rods 90, causes a re= verse rotation of the gear-'93, andconse': quently of the pattern.

The tracer roll 62 is mounted on a carriage 96 which is connected by a bar 97 with the long lever 98 which is pivoted, as at 99, to the arm 100 on the carriage 16. The-long lever 98 is pivoted at thebottom by the bolt 101 and is adjustable up and down by reason of the slot 102. The bar 97 is a pivotal connection to the movable element, suchasjthe strap 103, on the lever 98 and'can be moved up and down either side of the pivotal point 99 so as to give a relatively greater or less transverse movement of the stand 96 on the carriage, according towhether alarger or smaller reproduction is desiredfl 1 The mechanism for stopping themachine is illustrated more particularly in Figures 2and' 1, and 1 illustrate a bar 10 1slidably arranged and with one end adapted'to be engaged and pushed. by the carriage when it is close to the limit of its return movement, this bar abutting on the lever 105 which is connected, as: at 106, to the movable member 107 of the clutch, as shown par ticularly in Figure 12,the member 107 beingsecu'r'ed so that it rotates with the shaft 18, and the other member of the clutch being secured to the gear 31, the clutch being normally pushed together by the spring 109.

The lever 105 constitutes a belt shifter,

its free end 110 bracing the-belt 87 and swinging it when the clutch isdiSengaged, so as to shift the belt 87 to the pulley 111, which is an'idle pulley and will not rotate the shaft 86, so that all movement of the pattern and of the last is stopped.

In Figures 5 and 8 I show a means for pushing the work and the pattern away from the cutters and the tracer wheel when 1 the carriage has completed its movement in a forward direction, this being actuated when the nut 32 is slid into its reversing position, the nut having a suitable nose 112 which strikes a lever 113 which is fastened.

to the rear of the is pulled it pushes 11 1 on a push from Figure 10, is directly in rear of one of the rear brackets 65 and pushes it out so that the brackets are swung along with the frame to move the work clear of the cutters. When this movement occurs, the latch 116. fastened to a suitable point, such as the front rail 15, drops down so as to catch on the front rail 15, and when it stop 117, the frame thus being held against,

rotation.

The latch is released bythe'starting lever 37 which has a suitable projection 118 onit, and the parts are so disposed that when the carriage is returning to its normal or starting position under the latch 116, so that when the handle 39 is raised the latch 116 is. pushed up and forward at its'slotted end bar 115, which, as will be seen the starting "lever is directly the pieces of wood,- which are usually roughed out toapproximate the shape'of the finished article, are placed in. the frame 5 1 and the starting lever is pushed up by means ofits handle 39. This releases the latch 116and permits the work to be moved back and forth under-the influence ofthe weights 69, the nut 32 is released to put-the carriage in connection with the screw '17, the carriage proceeds tomove and'the bar @10 permits the spring 109 of the clutch to force the clutch members together and the belt shifter 105 movesthe belt 87 so that the i'rotating means of reached its limit of movement,the nut 32 is thrown iii-reverse, that is, in connection with the screw 18, as above described, and it also operates the push bar 115 against the influence-of the spring 119, to push the work awayfrom the cutters and the pattern away from the tracer wheel, and the latch 116 holds the brackets, and consequently the frame and the worlg away fro'm'contact with the cutters; in the meantime the carriage starting back on its return. As amp:- proaches its initial starting point the bar 114 is pushed and the above described shifting of the belt 87 to the idle pulley 111 takes place, and the clutch 107 is moved away so the pattern an'chthe lasts is in operation. When the carriage has that the gear 31 rotates idly and the reverse screw 18 stops. The work can now be removed and the above operation repeated.

This machine is constructed so-that vthe insertion and removal of the work is easy,-

since the articles are arranged at the front of the machine and the .multiplicity of finished products from the one pattern is accurately and quickly accomplished. The

frame to move so as tohold the work in a 9 straight line and at the same angle to the cutters, irrespective of the point along the frame on which the cutters are operating. This makes precision in the workpossible.

It will be evident that minor changes can be made in the construction and relation of the parts without departing from the. scope of the invention.

I claim: 1

1. A machine for cutting forms comprising a carriage with means for supporting a ser1es of cutters and for holding a tracing said brackets being arranged to swing and adapted to form the only support for the frame sothat in the movement of the frame the blocks are held always in the same plane relative to the cutters, and means for yieldingly pressing theframe toward the critters.

2. A machine for cutting forms comprising a carriage with means for supporting a series of cutters and for holding a tracing wheel, a frame having means for holding a series of blocks and a pattern, top and bottom bars on the frame, a pair of opposed U-shaped brackets at the front ofthe frame, a second pair of brackets at the rear of the bars, off-set ends on the brackets,

I inclined links connecting said ends and supporting the frame, and yielding means for pressing the frame toward the cutters.

3. A machine of the kind described comprising a frame having a sliding carriage l tliereon, means for propelling the carriage on its forward and return movements, said means including a shifting nut, a starting lever formed on its end into a latch for holding said nut in reverse position, cutters f" and a tracer wheel on said carriage, a frame for supporting stock and a pattern, means forcyieldingly forcing the frame toward the cutters, a push rod for forcing said frame away from the cutters and actuated by said nut, and a latch for holding the frame in such retracted position, the latch being disposed so that it is actuated by the starting lever when the starting lever is moved to release the nut from its reverse position. I

4:.II1 a. machine for cutting forms, a carriage with cutters and a tracing wheel, a frame with means for holding-stock and a pattern in a vertical plane and perpendicular to the plane of the cutters, horizontally swinging brackets at the front'and rear of the frame, said brackets having their free ends connected by links, said links forming the sole support of the frame,

and means for yieldingly pressing the. frame toward'the cutters. I ,5, In a machine forv cutting forms, a carriage with cutters and a tracing wheel, a frame with means for holding stock and a patternin' a vertical plane and perpendicular. to the plane of the cutters, a pair of horizontally swingingbrackets which when aligned are substantially in line with the frame, links connecting said brackets and pivotally connected tothe frame at the top and bottom thereof, a second pair of brackets in rear of the first, a link connecting-the second pair of brackets, rearwardly extending bars on the top and bottom of the frame and pivotally connected to the second link, and means for yieldingly pressing the frame toward the cutters.

In testimony thatI claim the foregoing,

I have hereto set my hand, this 2nd of June, 1921.

GEORGE W. DUCHEMIN. 

